I dont understand how to do this. Geometry

The angle represented as X is =
Calculation of the angle
From the diagram,
Triangle ∆ ABD = triangle ∆ CBD
Notice that < ADC = an acute angle which is = 90°; and
<ADC = < ADB + < CDB
But , < ADB= 49° and < CDB = 7x
90° = 49 + 7x
Make 7x the subject of formula,
7x = 90-49
7x = 41
X =41/7
X = 5.86
Therefore, X = 5.86.
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